Discussion
Find the missing number in the series:
2, 3, 5, 7, 11, ?
Answer: A
Correct answer: 13
The terms are the prime numbers in order - 2, 3, 5, 7, 11 - each divisible only by itself and 1. The next prime after 11 is 13; 12, 14 and 15 all have smaller factors.
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